TITLE

Fluid models of impurity transport via drift wave turbulence

AUTHOR(S)
Futatani, S.; Horton, W.; Benkadda, S.; Bespamyatnov, I. O.; Rowan, W. L.
PUB. DATE
July 2010
SOURCE
Physics of Plasmas;Jul2010, Vol. 17 Issue 7, p072512
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Turbulent transport due to drift waves is a critical issue for fusion physics across all magnetic confinement geometries. Three-component fluid equations are used to find the eigenmodes and eigenfrequencies of a nonuniform, magnetized plasma with a four dimensional fluctuation vector composed of fluctuations of the electron density, the working gas ion density, the impurity density, and the electrostatic plasma potential. This structure of the eigenmodes and eigenvectors is shown for two collisionality regimes: (i) the collisional drift waves appropriate for the scrape-off-layer and the edge plasma in limiter discharges and (ii) the trapped electron mode taken in the limit of a Terry–Horton fluid description for the core plasma. From the eigenmodes and eigenvectors the part of the density and potential fluctuations that are out-of-phase is computed. The quasilinear particle fluxes are analyzed as a function of the power spectrum of the plasma potential fluctuations and the gradient parameters characterizing the Ohmic, H, and internal transport barrier confinement modes. A reversal in a direction of impurity flux is observed by changing the sign of the impurity density gradient length. After reversal, the impurity flux is directed outward and it is a favorable for fusion plasmas.
ACCESSION #
52616071

 

Related Articles

  • Advances in validating gyrokinetic turbulence models against L- and H-mode plasmas. Holland, C.; Schmitz, L.; Rhodes, T. L.; Peebles, W. A.; Hillesheim, J. C.; Wang, G.; Zeng, L.; Doyle, E. J.; Smith, S. P.; Prater, R.; Burrell, K. H.; Candy, J.; Waltz, R. E.; Kinsey, J. E.; Staebler, G. M.; DeBoo, J. C.; Petty, C. C.; McKee, G. R.; Yan, Z.; White, A. E. // Physics of Plasmas;May2011, Vol. 18 Issue 5, p056113 

    Robust validation of predictive turbulent transport models requires quantitative comparisons to experimental measurements at multiple levels, over a range of physically relevant conditions. Toward this end, a series of carefully designed validation experiments has been performed on the DIII-D...

  • Fluctuation driven transport and stationary profiles. Kesner, J.; Garnier, D. T.; Mauel, M. E. // Physics of Plasmas;May2011, Vol. 18 Issue 5, p050703 

    Transport equations for particles and energy can be derived when the fluctuations conserve adiabatic invariants. The transport equations determine both stationary density and pressure profiles and the direction of the turbulence-driven fluxes which can be inward or outward. An inward turbulent...

  • Characterization of turbulence and transport in magnetic confinement devices. Rajkovic, M.; Watanabe, T.-H.; Sˇkoric, M. M. // AIP Conference Proceedings;4/4/2012, Vol. 1445 Issue 1, p15 

    Intermittency in the scrape-off layer (SOL) region of magnetically confined plasma and velocity intermittency of neutral fluid are compared from the aspect of global and local multifractal properties. Density fluctuations in the MAST device are considered and contrasted to local velocity...

  • Is Onsager symmetry relevant in the transport equations for magnetically confined plasmas? Balescu, R. // Physics of Fluids B: Plasma Physics;Mar91, Vol. 3 Issue 3, p564 

    A global, algebraic view of the transport processes in a magnetically confined plasma is developed. Both the neoclassical (banana) and the anomalous transport matrices are represented in a factorized form, thus separating the roles of the dynamics and of the geometric constraints. The...

  • Confinement of electron plasma by levitating dipole magnet. Saitoh, H.; Yoshida, Z.; Morikawa, J.; Yano, Y.; Hayashi, H.; Mizushima, T.; Kawai, Y.; Kobayashi, M.; Mikami, H. // Physics of Plasmas;Nov2010, Vol. 17 Issue 11, p112111 

    A recent experiment on the Ring Trap 1 device has demonstrated long-term (exceeding 300 s) confinement of non-neutral (pure electron) plasma in a dipole magnetic field; particles diffuse inward, steepening the density gradient and self-organizing into a stable vortex structure [Z. Yoshida et...

  • Recent results from the ATF torsatron. Murakami, M.; Aceto, S. C.; Anabitarte, E.; Anderson, D. T.; Anderson, F. S. B.; Batchelor, D. B.; Brañas, B.; Baylor, L. R.; Bell, G. L.; Bell, J. D.; Bigelow, T. S.; Carreras, B. A.; Colchin, R. J.; Crocker, N. A.; Crume, E. C.; Dominguez, N.; Dory, R. A.; Dunlap, J. L.; Dyer, G. R. // Physics of Fluids B: Plasma Physics;Aug91, Vol. 3 Issue 8, p2261 

    Recent experiments in the Advanced Toroidal Facility (ATF) torsatron [Plasma Physics and Controlled Nuclear Fusion Research 1990 (IAEA, Vienna, in press)] have emphasized the role of magnetic configuration control in transport studies. Long-pulse plasma operation up to 20 sec has been achieved...

  • Magnetic Fluctuation driven cross-field particle transport in the reversed-field pinch. Scheffel, Jan; Donghui Liu // Physics of Plasmas;Oct97, Vol. 4 Issue 10, p3620 

    Reports on cross-field particle transport in confined plasmas caused by electrostatic and electromagnetic fluctuations. Need for core localized turbulence to be kept at low levels for sufficient energy confinement in magnetic fusion plasmas; Inclusion of density gradient effects through the...

  • Fluid and Kinetic Modelling on Timescales Longer than the Confinement Time in Bounded Systems. Weiland, Jan; Zagorodny, Anatoly; Zasenko, Volodymyr // AIP Conference Proceedings;10/8/2009, Vol. 1174 Issue 1, p96 

    The problem of fluid modelling on timescales longer than the confinementtime is addressed as a problem of decay of high order moments without sources. Several mechanisms for the decay of higher order moments are discussed and very strong experimental evidence is given for toroidal plasmas.

  • A HYBRID METHOD TO SIMULATE AN INDUCTIVELY COUPLED AR-HG PLASMA. YANG LIU; ZISSIS, GEORGES; YUMING CHEN // Journal of Theoretical & Applied Information Technology;01/28/2013, Vol. 48 Issue 3, p1699 

    A hybrid method is used in simulating an inductively coupled Ar-Hg discharge plasma. In this hybrid model the combination of plasma fluid model and the Boltzmann Equation is applied. With this model, not only the "macroscopic" parameters of the discharge, such as electron density, electron...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics